You Are a Salesperson for a Pharmaceutical Company, a Job

You are a salesperson for a pharmaceutical company, a job it was difficult to get. After you'd been there a while, there was another opening, and you recommended your friend, Paul.  He was hired, and the two of you have enjoyed working together ever since. Recently, the secretary for the sales team has confided in you that Paul has been acting inappropriately, and most recently, cornered her in the supply room, and pushed her up against the wall with his body, and caressed her with his hands. She does not know that you recommended Paul to the firm. Of the following choices, what should you do? ​

A) tell her not to worry, that it will pass, because Paul is not normally like this
B) tell her not to worry, that you'll talk to Paul, and tell him to stop it
C) tell her to report Paul to Human Resources, and you'll tell them you saw it
D) talk to Paul, and tell him that if he doesn't stop it immediately, and apologize, you will report him to Human Resources